Thermostatic device.



H. H. FEHRENSCHILD.` THERMOSTATIC DEVICE. APPLICATION FILED APR.15, 1916.

Patented Mar. 6, 1917.

UNITED sTATEs PATENT oEEIcE.- `I l HENRY H. FEHRENSCHILD, 0F WESTWOOD, NEW JERSEY. i

THERMosT'ATIc DEVICE. j

To all 'whom t may concern:

Be it known thatI, HENRY H. FEHREN-y SCHILD, a citizen of the United States, residing at Westwood, in the county `of Bergen and Statev of New Jersey, have invented certain new and useful Improvements in Thermostatic Devices, of which the following is a specication.

My invention consists in a new and useful improvement in thermostatic devices,

more particularly that type ordinarily used' in incubatore and brooders for operating devices for controlling theheating system used in connection with the apparatus.

The novelty of my invention `resides in the unique combination of a number of thermostatic wafers, of the ordinary form used in incubators, so adapted that the action of any one or more of the wafers will operate the thermostatic device embodied in my invention. Experience has proved that the.

operation of any one or more of the wafers used will insure the the device;

In the drawings: Figure 1 is a plan device.

proper operation of Fig. 2 is a .section on line 2-v2, of Fig. l.4

In the drawings: The numeral 1 designates the cross-bar by which the device is held inA the place in which it is to operate. Aiixed at right angles to the cross-bar 1 is the second crossbar 2. At the'` ends of these cross-bars 1 and 2, are provided the pendant arms 3, pivoted to the cross-bars 1 and 2 in the pivot bearings 4. From .the lower end of these Specification of Letters Patent.

Aarms 3, extend the levers 5, pivoted tothe. arms 3 in the pivot bearings 6. Aixed to the under side of the cross-bar 1, are two thermostatic wafers' 7,v of the usual typerof wafers used in such devices. To the under Patented Mair.;- ,1917.-

Ap'pnca-tion med April 15, 191e. serial Np. 91,349.

side of the cross-bar 2, there are aiiixed twoj n n thermostatic wafers 7. lThese four wafers 7 are so placed as to rest upon the levers 5, so

that when the wafers 7 are expanded by.`

the increase in temperature the resulting action will operate the levers .5, swinging' them in the pivot bearings 6. At the point of juncture of the cross-arms; and 2, there is a circular orifice 8, extending through the cross-arms 1 vand 2,` through which there is dlsposed an operatlng rod 9, to the lower end of which YiS affixed the plate 10 by means I' of the set-'screw 11. This plate -10 is provided with four circular cavities 12 arranged in its upper face-so that each cavity 12 is In l1ne wia-th one of the levers 5 when the plate 10 .is 1n operative position'. From the .ends of the levers 5 adjacent to theplate 10 extend .rods 13 provided with down- .wardly projecting ends 14 adapted to rest in the cavities 12.

Thel foregoing description clearly vindii cates the method of voperation of this device.

'Any one of the four wafers' 7, being ex-- panded by an increase in temperature, would force its corresponding lever 5 downward .and through the rod 13 draw down the plate 10 and the operating rodA 9 connected.

ffwith the temperature control device.

The nature of the construction makes it aus..

apparent that the o erating rod 9 may-be supplied with a num r of plates-10 at varyi .'mg points, in which levers 5 operated byl bottom view of the wafers 'Z- might be placed, so that any number of wafers .7 could be used.

claim is: z l

. Having described my invention, what I 1.,The combination in a thermostatic de# A i vice of a single operating rod; a plurality of pivoted levers, each lever having its free end attached to the rod, and a thermostatic `wafer applied Ato each lever.'

" 2. The combination in a thermostatic device of a pair of cross-arms at right angles to one another, each provided at each of its ends with a pivoted endant arm; a lever ceve the ends of each of the projecting rods pivoted in the end o each of the pendant from each of the levers. 10 arms and provided with aprojecting rod; a In testimony whereof I afx my signathermostatic wafer axed to the under side ture in presence of a Wtness.`

5 of each end of each cross arm. and above each lever; and an operating rod passing HENRY H FEHRENSCHILD' through en orifice in the two cross arms Witness: Aand provlded Wlth a, plate adapted to re- JOHN E. HARING. 

